Telephone system



June 28, 1932. E. HORN TELEPHONE SYSTEM Filed Jan. 2, 1931 Tnuen nr-- EFL-151 Horn Patented June 28, 1932 NEE TA TENT OFFI ERNST HORN, F BERLIN, GERMANY, ASSZGNOR TO SIEMENS & HALSKE AKTIEN- GESELLSCHAFT, 03:

SIEMENSSTADT, NEAR BERLIN, GERMANY TELEPHONE SYSTEM Application filed January 2, 1931, Serial No. 506,025, and in Germany February 24, 1930.

The invention relates to a circuit arrangement in telephone systems with connecting devices, consisting of setting and conversational switches, in which the conversational switches re constructed with a plurality of wiper sets.

One object of the invention is to ettect the selection of the set of wipers to be used for setting up the connection in a simple and re liable manner. This is achieved by contact devices, which are influenced by the wipers of the setting switch to connect up one set of wipers of the conversational switch when the setting switch wipers are on certain of the bank contacts and the other set of wipers when the setting switch wipers are on certain other bank contacts.

Another object of the invention is to effect a guarding circuit as soon as a junction line is seized and to maintain the circuit for the duration of the connection. This guarding of a junction line, reached from the conversational switch, is achieved over the contact devices of the setting switch used for the control of the conversational switch.

. An embodiment of the invention is shown in the illustration.

A subscriber, represented by T1, can, over a preselector allocated to him, operate numerical impulse receivers namely IGVV, IIGVV, and LW for the purpose of setting up a connection with, for example, the subscriber T2. The numerical impulse receivers, with the exception of the numerical impulse receiver HGWV, are only shown schematically.

3-1,; Their setting can be effected in any known manner.

The numerical impulse receiver HGW consists of a conversational switch with two sets of wipers and a setting switch controlling its setting. The conversational switch moves only in one direction (rotation) and in such a manner that the setting switch marks the line group in which the conversational switch hunts for a free line.

In detail the connecting operation is as follows: When the subscriber T1 lifts his receiver, the preselector VW allocated to him, in known manner, is set by free hunting on to a succeeding numerical impulse receiver, by way of example, IGVV. At the seizure of this switch relay C is energized over: Earth, relay C, wiper of preselector VlV, resistance 721, battery, earth. Relay A is energized over the subscribers line loop in the following circuit: Earth, battery, winding I of relay A, wiper of preselector VVV, (Head, subscriber T1, b-lead, wiper of preselector VVJ, winding II of relay A, earth. At the transmission of numerical current impulses, relay A is intermittently deenergized by the breaking of this energizing circuit and causes thereby a setting of the numerical impulse receiver IGVV. The setting procedures are of no interest in this case. In the group reached by the number impulses the numerical impulse receiver IGVV hunts for a free connecting line which might, by way of example, lead to the shown numerical impulse receiver IIGVV. The following circuit is then completed: Earth, battery, winding 11 of relay C1, the winding I of relay V2, parallel therewith, rotary off-normal contact 'ew of the conversational switch, rotary off-normal contact 51126 of the setting switch, wiper 0 of the numerical impulse receiver IGVV, resistance W22, earth. Relays C1 and V2 respond in this circuit whereby relay C1 connects itself with its winding 1 over contact 301 to the just described circuit. By the closing of contact 7422 the rotary magnet Dc of the setting switch is connected to the (Head of the junction line.

lVhen the subscriber sends out the second impulse series for the setting of the numerical impulse receiver HGVV the line relay A falls back a number of times due to the breaking of the line loop. At contact 1a the line relay therefore sends impulses for operating the magnet De over: earth, battery, rotary magnet De of the setting switch, Winding II of relay V2, contacts 7412, 1a, 20, earth. Relay V2 remains uninterruptedly energized in this circuit during the impulse series. After the first rotary step of the setting switch the rotary off-normal contact sec is closed,

with the result that a circuit is closed for I contact 10106 of the setting switch, relay interrupter RU, earth.

If, for example, the subscriber transmits three impulses, e. g. operates the rotary magnet of the setting switch three times, the wiper (Ze reaches the contact 3. The wipers of the conversational switch are advanced by the rotary magnet D under control of inter rupter RU until the wiper (Z1 reaches the contact segment 3130 which is connected to contact 3 of the setting switch. At this time the following circuit is completedizl windings I and II of relay P, contact 2101, wiper (Z0 of the settings *itch, contact 3, contact segment 3130,,wiper cZlof the conversational switch, contact 25o2, resistance U2, battery, earth. Relay P responds in this circuit and by the opening of contact 12 bringsthe rotary magnet D of the conversational switch to rest. After the deenergization of relay V2 at the termination of the current impulse series, the just described energizing circuit for relay P'is cutoff at contact 257)? and by the closing of contact 24o2relay P'is connected to the wiper 01 of the conversational switch. Assuming now that the contact engaged by wiper 01 is busy, relay P falls back. The rotary magnet D is now energized afresh due to the closing of the contact- 12 over: earth, battery, rotary magnet D, contact 12;), rotary ofiY-normal contact 1110 of the conversational switch, relay interrupter RU, earth. The conversational switch now hunts freely for an idle junction line leading to a succeeding numerical impulse receiver. hen this has been reached, the followingcircui't is completed earth, windings I and II of relay P, contact 2101, wiper cle of the setting switch, contact 3, contact segment 3l30, wiper d1 of the conversational switch, contact 24112, wiper 01 of the conversational switch, resistance W3, battery, earth. Relay P responds in this circuit and by opening the contact 20 short circuits the high resistance winding I of. relay P and guards thereby the reached junction line; in addition, the conversational switch is brought to rest by the opening of contact 12;). The numerical impulse receiver LIV is now reached over the wiper-set a1 and 61.

The ewitching over from the wiper set a1 and 61 to the wiper set a2 and b2 is effected by the rotary off-normal contacts 151116, 16206, 17we, and 18we, respectively. These rotary ofi-normal contacts are mechanically operated by the switch shaft of the setting switch which is moved by the rotary magnet D0 in such a way, that, at each odd rotary step of the setting switch contacts 15we and 17106, respectively, are closed; and at each even rotary step contacts 1610c and 18106, respectively, are closed. This is conveniently done for example, by means of a cam clel, having five notches corresponding to the five even steps 2, 4:,'6,-etc;, of the setting switch. This earth, v.

that is to say the evenstep-junction lines, are

accessible over the wiper set a2 and 62.

By the transmission of further impulses the numerical impulse receiver LlV can be set to the-required subscriber T2 after the setting of the numerical impulse receiver IIGTV. By the transmission of ringing current the calling subscriber T1 is connected to the required subscriber when he replies.

The release, after the termination of the conversation, can be effected in any manner of no interest in this case.

'What is claimed is:

1. In an automatic telephone system, a switch having a plurality of sets of wipers, a second switch individual to said first switch arranged to control the positioning of said first switch, and mechanical means in said second switch for selecting the set of wipers over which the connection is to be completed.

2. In an automatic telephone system, a switch having a plurality of sets of wipers, a second switch individual to said first switch having a shaft and'wiper, a cam on said shaft for connecting one or the other set of wipers in the first switch, and means controlled over the wiper of said second switch for controlling the positioning, of the connected set of wipers.

3. In an automatic telephone system, an incoming trunk line, an outgoing trunk line, a switch for interconnecting said trunk lines, a plurality of sets of wipers for said switch, a second switch connected to said first switch arranged to control the positioning of said first switch, mechanical means in said-second switch for selecting one of said sets of wipers, and'means operative responsive to the establishment of a connection between said trunk lines for guarding said outgoing trunk line over a wiper of said second switch.

4. In an automatic telephone system, a switch having a plurality of sets of wipers,a second switch individual to said first switch arranged to control the positioning of said first switch,'mechanical meansin said second switch for selectingthe set of wipers over which the connection is to be completed, and means operative over the wiper of said second switch for guarding a connection completed over said first switch.

5. In an automatic telephone system, a switch having a plurality of sets of wipers, a second switch individual to said first switch arranged to control the positioning of said first switch, mechanicalmeans in said second switch for selecting the set of Wipers over which the connection is to be completed, and means operative over the wiper of said second switch for guarding a connection completed over said first switch irrespective of the set of Wipers used.

6. In an automatic telephone system, a switch having a plurality of sets of wipers, an auxiliary switch connected thereto, means for positioning said auxiliary switch, a test Wiper for each of said sets of wipers, means operative responsive to the positioning of said auxiliary switch for automatically steppng said first switch and for connecting one of said sets of wipers, and means controlled over one of said test wipers and the wipers of said auxiliary switch for stopping the stepping of said first switch.

7. In an automatic telephone system, a calling line, a called line, a calling device, an auxiliary switch operative responsive to the operation of said calling device, a single motion connecting device for connecting call ing and called lines, said connecting device consisting of a certain number of series of contacts, and an equal number of sets of wipers, means for setting said wipers in accordance with the position of said auxiliary switch, and means controlled over one of said wipers and a wiper of said auxiliary switch for controlling the setting of said connecting device.

8. In an automatic telephone system, a calling line, a called line, a calling device, an auxiliary switch operative responsive to the operation of said calling device, a single motion connecting device for connecting calling and called lines, said connecting device consisting of a certain number of series of contacts, and an equal number of sets of wipers, means for setting said wipers in accordance With the position of said auxiliary switch, and means for mechanically connecting a certain series of wipers in the connecting device according to the position of said auxiliary switch.

In witness whereof, I hereunto subscribe my name this 3rd day of December, A. D.

ERNST HORN. 

